Step 6: Keep in mind some dangers:

Step 7: For optimization...

Obviously, the torches are not reusable, but for next time: If the center burned down too quickly, make the center smaller next time. If it took to mu...

Step 2: Roll the Cardboard

Roll the cardboard so that the corrugation is parallel to the direction of the roll. (this will augment air flow)
Leave slightly less than one inch of space in the center, and roll tightly around that. For best results, there should be about 5-7 layers of wrapped cardboard.